Typing Field Isolates of Infectious Bronchitis by the Plaque-Reduction Test

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Abstract
A technique is described for typing field isolates of infectious bronchitis virus by plaque-reduction assay of the serum antibody response of chickens experimentally infected with such isolates. Also reported are use of the technique with field isolates and a comparison of results obtained in plaque-reduction assay and in tracheal-ring organ-culture assay.